11681091 has 30 divisors (see below), whose sum is σ = 18573500. Its totient is φ = 7314624.

The previous prime is 11681081. The next prime is 11681093. The reversal of 11681091 is 19018611.

11681091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11681091 - 2¹⁴ = 11664707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11681093) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 23160 + ... + 23658.

Almost surely, 2^11681091 is an apocalyptic number.

11681091 is a deficient number, since it is larger than the sum of its proper divisors (6892409).

11681091 is an equidigital number, since it uses as much as digits as its factorization.

11681091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 11681091 is about 3417.7611092644. The cubic root of 11681091 is about 226.8965029821.

The spelling of 11681091 in words is "eleven million, six hundred eighty-one thousand, ninety-one".